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Table 1 The prevalence of sleep disturbances identified by the PDSS with different disease severity

From: Tremor and clinical fluctuation are related to sleep disorders in Chinese patients with Parkinson’s disease

H&Y stage H&Y = 1 H&Y = 2 H&Y = 3 H&Y = 4 total
PDSS score
<90 3 8 11 4 26
PDSS group % 11.5% 30.8% 42.3% 15.4% 100.0%
H&Y stage % 10.7% 11.8% 35.5% 44.4% 19.1%
90 ~ 105 2 13 7 2 24
PDSS group % 8.3% 54.2% 29.2% 8.3% 100.0%
H&Y stage % 7.1% 19.1% 22.6% 22.2% 17.6%
>105 23 47 13 3 86
PDSS group % 26.7% 54.7% 15.1% 3.5% 100.0%
H&Y stage % 82.1% 69.1% 41.9% 33.3% 63.2%
total 28 68 31 9 136
PDSS group % 20.6% 50.0% 22.8% 6.6% 100.0%
H&Y stage % 100.0% 100.0% 100.0% 100.0% 100.0%